Progestogen Therapy: Effects, Uses and Side Effects
Progestogen therapy is a hormonal treatment using progestogens (corpus luteum hormones), applied in gynaecology, contraception, and hormone replacement therapy.
Things worth knowing about "Progestogen therapy"
Progestogen therapy is a hormonal treatment using progestogens (corpus luteum hormones), applied in gynaecology, contraception, and hormone replacement therapy.
What is Progestogen Therapy?
Progestogen therapy refers to the medical use of progestogens – a group of hormones that structurally or functionally resemble progesterone, the naturally occurring corpus luteum hormone produced in the female body. Progestogens may be natural (e.g., micronised progesterone) or synthetic (known as progestins). They are central to many areas of gynaecology and are a key component of hormone replacement therapy.
Mechanism of Action
Progestogens bind to specific progesterone receptors in various body tissues, triggering a wide range of biological responses. Key effects include:
- Suppression of ovulation through negative feedback on the pituitary gland and hypothalamus
- Thickening of cervical mucus, which impedes sperm from entering the uterus
- Inhibition of endometrial proliferation, creating a secretory phase unsuitable for implantation
- Support and maintenance of early pregnancy during the luteal phase
- Anti-oestrogenic (antiproliferative) effect on the endometrium
Indications
Contraception
In contraception, progestogens are used both in combination with oestrogens (combined hormonal contraceptives such as the combined oral contraceptive pill) and as standalone agents. Progestogen-only preparations include the mini-pill, progestogen injections (e.g., depot medroxyprogesterone acetate), hormonal implants, and hormonal intrauterine devices (levonorgestrel IUS).
Hormone Replacement Therapy (HRT)
During the menopause, progestogens are combined with oestrogens in hormone replacement therapy to reduce the risk of endometrial hyperplasia (abnormal thickening of the uterine lining) and associated endometrial cancer. Women who have had a hysterectomy generally do not require progestogens.
Gynaecological Conditions
Progestogen therapy is used in the management of various gynaecological conditions, including:
- Endometriosis: Progestogens suppress the growth of endometriotic lesions and alleviate pelvic pain.
- Uterine fibroids (myomas): Certain progestogens may help relieve associated symptoms.
- Dysfunctional uterine bleeding: Irregular or heavy menstrual bleeding can be regulated with progestogens.
- Premenstrual syndrome (PMS) and premenstrual dysphoric disorder (PMDD)
- Luteal phase deficiency: Luteal phase support, particularly in assisted reproductive technology (ART).
Oncology
High-dose progestogens (e.g., megestrol acetate, medroxyprogesterone acetate) are used in oncology for the treatment of certain hormone-sensitive cancers, particularly endometrial carcinoma and in some settings breast cancer, as well as for cancer-related cachexia (loss of appetite and weight loss in cancer patients).
Dosage Forms and Administration
Progestogens are available in a variety of formulations:
- Oral: Tablets (e.g., mini-pill, oral progesterone capsules)
- Transdermal: Patches or gels in combination with oestrogens
- Vaginal: Suppositories, capsules, or gels (especially micronised progesterone)
- Intrauterine: Hormonal coils (e.g., containing levonorgestrel)
- Subcutaneous / intramuscular: Implants or injections
Dosage depends on the indication, the specific progestogen used, and the individual needs of the patient. The appropriate regimen should always be determined by a qualified healthcare professional.
Side Effects
Like all hormone therapies, progestogen therapy may cause side effects. Commonly reported side effects include:
- Mood changes and depressive episodes
- Weight gain
- Breast tenderness
- Changes in bleeding patterns (spotting, absent periods)
- Changes in libido
- Acne and oily skin (particularly with androgenic progestogens)
- Headaches
More serious risks, particularly with long-term use or in combination with oestrogens, may include an increased risk of thromboembolic events and, in certain circumstances, a slightly elevated breast cancer risk. Individual risk should always be assessed by a healthcare professional.
Contraindications
Progestogens should not be used, or used only with careful medical consideration, in the following situations:
- Known or suspected hormone-dependent tumours
- Unexplained vaginal bleeding
- Severe liver disease
- History of thromboembolic events (depending on the specific preparation)
- Known hypersensitivity to the active substance
References
- Strowitzki, T. et al. – Progestogens in Gynaecology. Gynecological Endocrinology, Springer, 2020.
- World Health Organization (WHO) – Medical Eligibility Criteria for Contraceptive Use, 5th Edition, 2015. Available at: https://www.who.int
- Beral, V. et al. – Breast cancer and hormone replacement therapy: collaborative reanalysis of data from 51 epidemiological studies. The Lancet, 1997. Available at: https://www.thelancet.com
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